On Liquid Viscosity Effects on Droplet Splash and Receding Breakup on a Smooth Solid Surface at Atmospheric Pressure

Splash wave and crown breakup after disc impact on a liquid surface

In this paper we analyze the impact of a circular disc on a free surface using experiments, potential flow numerical simulations and theory. We focus our attention both on the study of the generation and possible breakup of the splash wave created after the impact and on the calculation of the force on the disc. We have experimentally found that drops are only ejected from the rim located at the top part of the splash --giving rise to what is known as the crown splash-- if the impact Weber number exceeds a threshold value $\Weber_{crit}\simeq 140$. We explain this threshold by defining a local…

Simulations of splashing high and low viscosity droplets

In this work simulations are presented of low viscosity ethanol and high viscosity silicone oil droplets impacting on a dry solid surface at atmospheric and reduced ambient pressure. The simulations are able to capture both the effect of the ambient gas pressure and liquid viscosity on droplet impact and breakup. The results suggests that the early time droplet impact and gas film behavior for both low and high viscosity liquids share the same physics. However, for later time liquid sheet formation and breakup high and low viscosity liquids behave differently. These results explain why for bot…

Viscoelastic Liquid Bridge Breakup and Liquid Transfer Between two Surfaces

We studied experimentally the breakup of liquid bridges made of aqueous solutions of Poly(acrylic acid) between two separating solid surfaces with freely moving contact lines. For polymer concentrations higher than a certain threshold ($\sim$ 30 ppm), the contact line on the surface with the highest receding contact angle fully retracts before the liquid bridge capillary breakup takes place at its neck. This means that all the liquid remains attached to the opposing surface when the surfaces are separated. This behavior occurs regardless of the range of liquid volume and stretching speed studi…

The motion, stability and breakup of a stretching liquid bridge with a receding contact line

The complex behavior of drop deposition on a hydrophobic surface is considered by looking at a model problem in which the evolution of a constant-volume liquid bridge is studied as the bridge is stretched. The bridge is pinned with a fixed diameter at the upper contact point, but the contact line at the lower attachment point is free to move on a smooth substrate. Experiments indicate that initially, as the bridge is stretched, the lower contact line slowly retreats inwards. However at a critical radius, the bridge becomes unstable, and the contact line accelerates dramatically, moving inwards…

静电减缓固体表面上液桥的断裂

Electrostatics slows down the breakup of liquid bridges on solid surfaces

本文通过实验研究非导电表面上水-甘油液桥的断裂，发现滑动带电产生的静电力会减缓断裂动力学并驱动卫星液滴自发运动，证明滑动带电在去润湿过程中具有重要作用。

莱顿弗罗斯特条件下柴油替代燃料液滴壁面撞击中层流变薄与破碎的实验与模型辅助分析

Experimental and model-assisted analysis of lamella thinning and breakup in diesel-surrogate fuel-droplet wall impingement under Leidenfrost conditions

研究正十六烷单液滴在300 - 500°C、韦伯数5.77 - 208.61的加热不锈钢壁面上的铺展与破碎，通过高速背光图像实验并结合层流 - 边缘模型分析，结果表明模型推断的层流厚度能补充传统状态图，为破碎时间提供局部状态信息。